• Abnormal eye contact
• Not orienting when name is called
• Preferring to be alone/ignoring others
• Limited imitation (Not waving hello or bye-bye)
• Not initiating social games (peek-a-boo)
• Little interest in being held
• Delay/deficits in joint attention
• Limited pointing/gestures

.

• Echolalia (repeating)
• No babbling by 12 months
• No single words by 16 months
• No 2-word spontaneous phrases by 24 months
• Peculiar use of language
• Lack of pretend play
• Failure to attract attention to self
• Use of early forms of communication

• Obsession with objects, interests, or routines
• Inappropriate or unusual toy play
• Repetitive body movements/unusual body postures
• Attachment to unusual objects
• Over or under sensitivity to sensory stimuli
• Inconsistent response to sound
• Unusual visual interests
• Insensitive to pain, cold, or heat
• Hypersensitive to taste